Setting the lsdb overload bit, Configuring system id to host name mappings – H3C Technologies H3C SR8800 User Manual
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Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
3.
Configure the SPF
calculation interval.
timer spf maximum-interval [ initial-interval
[ second-wait-interval ] ]
Optional.
The default SPF calculation
interval is 10 seconds.
Setting the LSDB overload bit
By setting the overload bit in sent LSPs, a router informs other routers of a failure that makes it incapable
of routing and forwarding packets.
When an IS-IS router cannot record the complete LSDB due to running out of memory or some other
reasons, it will calculate wrong routes. To make troubleshooting easier, you can temporarily isolate the
router from the IS-IS network by setting the overload bit.
To set the LSDB overload bit:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS view.
isis [ process-id ] [ vpn-instance vpn-instance-name ]
N/A
3.
Set the overload bit.
set-overload [ on-startup [ [ start-from-nbr system-id
[ timeout1 [ nbr-timeout ] ] ] | timeout2 ] [ allow { external
| interlevel } * ]
Not set by default
Configuring system ID to host name mappings
In IS-IS, a system ID identifies a router or host uniquely. A system ID has a fixed length of 6 bytes. When
an administrator needs to view IS-IS neighbor information, routing table or LSDB information, using the
system IDs in dotted decimal notation is not convenient. To solve it, you can configure the mappings
between system IDs and host names since host names are easier to remember and use.
Such mappings can be configured manually or dynamically.
•
Using the display isis lsdb command on a router configured with dynamic system ID to host name
mapping displays router names rather than system IDs.
•
If you configure both dynamic and static system ID to host name mappings on a router, the host
name for dynamic system ID to host name mapping applies.
Configuring a static system ID to host name mapping
To configure a static system ID to host name mapping:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A